PSR-0315 AMPX-77.

1. NAME OR DESIGNATION OF PROGRAM:  AMPX-77 (Modular Code System for
Generating Coupled Multigroup Neutron-Gamma Libraries from ENDF/B).

3. DESCRIPTION OF PROGRAM OR FUNCTION

The AMPX system is a system of  computer programs (modules) capable of producing coupled multigroup  neutron-gamma-ray cross section sets. The system is one of the standards for producing multigroup neutron, gamma-ray production, gamma-ray interaction, and coupled neutron-gamma cross-section sets  from ENDF data. AMPX-produced cross sections can be used directly with a variety of diffusion theory, discrete ordinates, and Monte Carlo radiation transport computer codes. A one-dimensional Sn calculation capability is provided for general use and for cross section collapsing. Treatments are included for resonance self-shielding effects.

4. METHOD OF SOLUTION

The system includes a full range of features needed to: (1) produce multigroup neutron, gamma-ray production, and/or gamma-ray interaction cross-section data, (2) resonance self-shield, (3) spectrally collapse, (4) convert cross-section libraries from one format to another format, (5) execute a one- dimensional (1-D) discrete-ordinates calculation, and (6) perform miscellaneous cross section-operations.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The principal restriction is the availability of adequate core storage. All large  modules are variably dimensioned. Certain modules will automatically use external storage (disk,tape), if in-core storage is inadequate.  While these procedures are of little consequence on today's large computers with "virtual memory" capabilities, they can be important  when small-core PC's or workstations are used.

6. TYPICAL RUNNING TIME

Running times are extremely problem dependent and depend heavily on the modules selected.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

The primary AMPX-77 modules support Version 5 and earlier, although it is possible to process many Version 6 evaluations. There are 47 modules in the AMPX-77 system. A partial list follows.

AIM Converts master cross-section libraries from BCD                     to binary format (or vice-versa).
ALPO                Produces ANISN libraries from AMPX master
                    libraries.
ALE                 Produces listings of data from AMPX master and
                    working interfaces.
AJAX                Merges, collects, reorders, joins, and/or
                    copies selected data sets from AMPX master
                    interfaces.
COMAND              Collapses ANISN cross-section libraries.
CONTAC              Produces ANISN or CCCC ISOTXS libraries from
                    AMPX working libraries.
ICE-2               Mixes cross sections on an AMPX working library
and produces a macroscopic AMPX working library,                     ANISN libraries, or group-independent ANISN
                    cross-section libraries.
LAPHNGAS            Generates multigroup secondary gamma-ray
                    production cross sections and/or multiplicities
                    from ENDF/B point data.
LAVA                Produces an AMPX working library from an ANISN
                    cross-section library.
MALOCS              Collapses fine-group AMPX master libraries into
                    broad-group AMPX master libraries.
NITAWL-II           Converts from the AMPX master library format to
                    an AMPX working library. Optionally, it will
                    perform a Nordheim integral treatment
                    calculation for nuclides with resonance
                    parameters.
RADE                Used to perform checks on AMPX master, AMPX
                    working, and ANISN libraries.
ROLAIDS             Performs an integral transport calculation for
                    the energy-pointwise, slowing-down flux distri-
                    bution in each zone of a 1-D, multiregion
                    geometry to produce multigroup resonance-
                    sh
ielded constants.
SMUG                Generates a photon-interaction master library
                    from ENDF/B data.
TABU Produces an AMPX master cross-section file which                     contains Bondarenko factor data for the
                    unresolved energy region.
VASELINE            Produces plots of cross sections from ENDF/B
                    libraries or from AMPX master or working
                    libraries.
WAX                 Collects data from one or more AMPX working
                    libraries to create a new working library.
UNITAB              Combines data for a nuclide from more than one
                    AMPX master library to create a new AMPX master
                    library.
WORM                Reads an AMPX working library and reformats it
                    to write an AMPX master library.
XLACS               Uses ENDF/B data to produce multigroup neutron
                    cross sections on an AMPX master library.
XSDRNPM             Performs a 1-D discrete-ordinates or diffusion
                    theory calculation using cross sections on an
                    AMPX working library.

10. REFERENCES:

- N.M. Greene, W.E. Ford III, L.M. Petrie and J.W. Arwood:
  AMPX-77 - A Modular Code System for Generating Coupled Multigroup
  Neutron-Gamma Cross-Section Libraries from ENDF/B-IV and/or
  ENDF/B-V
  ORNL/CSD/TM-283 (October 1992).

11. MACHINE REQUIREMENTS

AMPX-77 is operable on the IBM 3090 and CRAY  computers. In the latter case, the modules have been used in both the CRAY CTSS and UNICOS environments. Many modules have been used on UNIX-based workstations such as the IBM RISC 6000, the DEC 5000 and the HP.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

AMPX-77 uses Fortran-77 and Assembler on the IBM system and Fortran-77 and some "C" on UNICOS systems. The IBM version was tested using the VS compiler (Level 2.2.0) and Assembler Level H running under OS/VS2. After processing with the conversion program included, the system was tested on a Cray under UNICOS using the CFT77 compiler. DISSPLA  software is required for VASELINE.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by:
                Radiation Shielding Information Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

miscellaneous    mag tapeREADME.NOW Information File                MISTP
miscellaneous    mag tapeREADME.GEN Gen. Instructions for IBM & CrayMISTP
miscellaneous    mag tapeREADME.CRA Instructions for Cray Users     MISTP
source program   mag tapeCRAYFORT.EXE Compress. File FTN Source CraySRCTP
test-case data   mag tapeIBMJCL.EXE Compress. File JCL & Input IBM  DATTP
test-case data   mag tapeCRAYJCL.EXE Compress. File JCL & Input CrayDATTP
test-case data   mag tapeDATA.EXE Compress. File ASCII Data IBM&Cray DATTP
source program   mag tapeSOURCE.EXE Compress. File Fortran Source   SRCTP
test-case output mag tapeOUTPUT.EXE Compress. File Output from Cray OUTTP
report                   ORNL/CSD/TM-283 (October 1992)             REPPT